When in the pre-mission lobby, down by the bottom right corner of the screen you'll notice a panel detailing difficulty and privacy settings. If you highlight this panel by pushing from the map icon where you select your next mission, you can then press to alter these options. Start from the very first main mission, and play through them one by one making sure you're set to the 'three-star' difficulty each time. I recommend bringing a friend and going through this with a least two players as it can get pretty tough. The main gameplay is survivable, but the boss battles - even early ones such as Shatterjack - can take their toll on the unprepared solo player.

General tips:

Stock up with items between levels.

If playing co-op, save your items for the boss battles.

Be prepared to revive fallen players (run over to them and hit ) from time to time.

Although not necessary for the achievement, I recommend playing the star-shaped side missions to gain useful items, and the circular ones to upgrade them.

You can play through with a character you've already upgraded and levelled, which makes some of the earlier missions a breeze.

Unlike Deity difficulty, enemies do not scale with you forvever as you level up, so feel free to come back difficult missions once your character has been made stronger.

For co-op leveling and gold grinding, play the Shalekast level repeatedly on the hardest difficulty you can manage.

Once you've completed every mission on any difficulty, you'll unlock Deity - four-star - and monsters will begin leveling with you. Good luck with that one!

If you play Deity before finishing each mission on Legend, you WILL have to play them again - the difficulties do not stack.

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